Apparatus for simultaneously drilling and tapping a plurality of work pieces at each of a plurality of positions

ABSTRACT

The apparatus, intended primarily for simultaneously drilling and tapping a plurality of work pieces at each of a plurality of working positions includes an annular table supporting a plurality of tapping and drilling assemblies at a plurality of spaced working positions. Rotably mounted within the annular table support is a turret having a plurality of radial arms on which are supported retractible work supporting shuttles movable toward and from working positions adjacent the tapping and drilling assemblies mounted on the annular table. Means are provided for rotating the turret to successive working positions. A novel clamp and positioning means are mounted on the shuttles for holding and accurately positioning a work supporting cartridge. Novel multiple spindle tapping and drilling assemblies permit tapping and drilling from different angles, simultaneously of a plurality of rigidly held work pieces mounted on the shuttles.

1 May6,1975

United States Patent 1191 Hoglund APPARATUS FOR SIMULTANEOUSLY DRILLING AND TAPPING A PLURALITY Primary ExaminerAndrew Juhasz OF WORK PIECES AT EACH ()1? A Assistant Examiner-W. R. Briggs p u y 0F POSITIONS Attorney, Agent, or Firm-Pennie & Edmonds I S u o e n a .n u m M r .m l Cm Am Rfi P S M n e t .m S, u t a r a P P a 6 on y k e k m 1 n 5 mm m m. r o C d e n .mn as mom ne NTH ma tn n8 e VS .mA fin UH.

drilling and tapping a plurality of work pieces at each 22 Filed: Sept. 10,1913

1211 Appl. No.: 395,760

of a plurality of working positions includes an annular table supporting a plurality of tapping and drilling assemblies at a plurality of spaced working positions. Rotably mounted within the annular table support is a Related US. Application Data coplinufllion 0f April I972. turret having a plurality of radial arms on which are which is a divisifln of S N0. 82 1 supported retractible work supporting shuttles mov- I971, which is a division of Ser. No. 763,043, Sept. 9, i968. abandoned.

able toward and from working positions adjacent the tapping and drilling assemblies mounted on the annular table. Means are provided for rotating the turret to successive working positions. A novel clamp and posi tioning means are mounted on the shuttles for holding and accurately positioning a work supporting car- 16 slw I, 8 89 3 m lw ;%52 C2 885 3 1 W .1. 2 B 5 8 2 0 M 4 mum W m mnr Ha "N L h l WM .w UmF Hum own tridge. Novel multiple spindle tapping and drilling assemblies permit tapping and drilling from different angles, simultaneously of a plurality of rigidly held work pieces mounted on the shuttles.

[56] References Cited UNITED STATES PATENTS 699,613 5/1902 29/38 c 946,458 1/1910 408/51 1 Claim 13 Drawing Figures rillgq PATENIEDMAY 51975 SHEET 011]? H PATENIEEW sasrs 3.881.836

sum um 11 PATENIEE HAT 8137 mzmium Sims SHEET 098$ H PIJEMEURM BiHYS 1.881.836

sum 10% 11 APPARATUS FOR SIMULTANEOUSLY DRILLING AND TAPPING A PLURALITY OF WORK PIECES AT EACH OF A PLURALITY F POSITIONS This is a continuation of application Ser. No. 247,572, filed Apr. 26, I972, which is, in turn, a divisional of Ser. No. 118,218 filed Feb. 24, 1971, which is in turn, a divisional of Ser. No. 763,043, filed Sept. 9, I968, and now abandoned.

BACKGROUND OF THE INVENTION Present equipment such as in line equipment is not normally designed to process at one working station more than one work piece not generally to perform more than one operation at each working station. In line equipment requires much space to accomodate the different working positions. A work piece has to be moved manually from the last working position for further processing or packaging. Registering a work piece with its working position is difficult. Link chains carrying the work holder of fixture which chains are usually used on in line equipment have stretch and wear and thus particularly where extreme accuracies are required in line equipment is not satisfactory. Turret machines presently available have very complicated mechanisms to carry the work pieces to a working position and are incapable of performing multiple operations on a plurality of work pieces in a single working position. Equipment for performing working operations from all sides; that is from all sides of work piece as well as the top and bottom without rotating the work piece from a fixed position in a fixture have not heretofore been available.

SUMMARY OF THE INVENTION The apparatus which is capable of simultaneously drilling and tapping a plurality of work pieces at each of a plurality of work positions includes an annularly shaped supporting table. This table provides a work loading position and supports a plurality of spaced drilling and tapping assemblies at spaced working positions there around. A rotatable work supporting turret is positioned centrally of the annular tool assembly supporting table. It is provided with a plurality of radially directed slide guides.

Slidably mounted on the guides are retractable shuttles which can be moved into work positions adjacent the tool assemblies when the turret is indexed to successive working positions. The work pieces are secured to cartridges or fixtures which are releasably clamped to the shuttles. Each cartridge supports a plurality of work pieces. The clamps are automatically released at the discharge position when all operations are completed on the work pieces. Means on the shuttles and on the annular table contact the cartridge for very accurately positioning the work pieces.

Novel multiple tool drilling assembleys make it possible to side tap work pieces where the directions of drilling may be done horizontally at angles to each other. A plurality of spindles parallel to each other are carried in a common housing and are offset successively. A common drive rotates all spindles at the same speed of rotation. Other means advance the tools quickly to working position and retract them rapidly after drilling operations are completed.

The multiple tool tapping assemblies having some of the features of the drilling tool assemblies include means for accurately and rapidly positioning the bank of tapping tools against the work pieces for expediting tapping operations.

The timing of indexing is such that both the drilling and tapping operations at all stations are completed and the shuttles retracted before indexing takes place.

The movement of the drilling assemblies and the tapping assemblies are controlled by circuits which are controlled by trippers and switches responsive to the movement of the assemblies.

DESCRIPTION OF DRAWINGS Referring to the drawings,

FIGS. la and 1b show a plan view of a complete machine assembly incorporating my invention,

FIG. 2 is a partial perspective of the apparatus shown in FIG. 1 showing details of construction,

FIG. 3 is a side elevation partially in section showing details of construction of a multiple drill assembly made according to my invention,

FIG. 4 is a section taken along the line 4-4 of FIG.

FIG. 5 is a left end view of FIG. 3,

FIG. 6 is a section taken along line 6-6 of FIG. 5 showing details of the retractor,

FIG. 7 is a perspective of a pair of drill assemblies show at Station 2 of the complete assembly with a shuttle in working position,

FIG. 8 is a side elevation of the multiple tapping assembly made according to my invention and partially in section to show details of construction,

FIG. 9 is a horizonal section taken along the line 99 of FIG. 10,

FIG. 10 is a section taken along the line 10-10 of FIG. 9,

FIG. 11 is a schematic control circuit diagram for the drilling assembly as tied in with the indexing circuit, and

FIG. 12 is a schematic control circuit diagram for the tapping assembly as tied in with the indexing circuit.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIGS. 1 and 2, one form of apparatus made according to my invention includes an annular tool assembly supporting table 20. There are six positions or stations on the table, but more or less could be provided.

At station I the shuttles are loaded with the work filled cartridge and also unloaded after all operations are completed.

At station 2, there are provided two banks or drilling assemblies 21 and 22 which will be described in greater detail below. It will be noted that the spindles are mounted at an angle to each other and to the center line passing through the work pieces for side drilling. One set of drills completes its drilling operation before the second set begins operations to prevent drills contacting each other particularly if small work pieces are involved.

At station 3 vertical and horizonal drilling operations take place. Drilling assembly 23 is mounted for vertical movement on guides or ways 24 and 25. The other drilling assembly 26 provides for horizonal drilling.

At station 4, the tapping assembly 27 taps from the top and the drilling assembly 28 drills from the side.

At station 5 the work pieces are drilled from the top by assembly 29, and from the side by the drill assembly 30. Reaming can also be done instead of drilling.

At station 6. the last working position. tapping is done from the top by tapping assembly 3], horizontally by tapping assembly 32, and drilling is done from the side by drilling assembly 33.

Rotatably mounted within the central opening of the annular table 20, is the turret 35, provided with the radially directed work supporting slide guides 36. 37, 38, 39. 40 and 4] each of which supports a shuttle 42. 43, 44. 45, 46 and 47. These shuttles support and have clamped thereon during working operations work loaded cartridges 50. 51, 52, 53, 54 and 5 5. These shuttles and cartridges are described and claimed in a copending application. An air manifold 56 provides the air for operating air cylinders 60, 61, 62, 63, 64 and 65 which function to move the shuttles into work operating positions,

Switches and tripping mechanisms for controlling operation of the drilling assemblies and tapping assemblies will be described below.

DRILLING ASSEMBLIES The drilling spindle assembly comprises two major sub-assemblies relatively movable with respect to each other. Both are slidahly mounted on the same base. One sub-assembly includes the drill bushings which are rapidly advanced into working position closely adjacent the work pieces and then remain stationary. The drilling spindle sub-assembly includes the spindles and drills and is moved forward with the bushing subassembly initially. When the bushing sub-assembly comes to rest. a rotating cam and a contacting follower element come into operation to advance the drills. A driving motor connected to drive the drills is energized when the bushing sub-assembly reaches its working position. After the drilling operations are completed the entire drill spindle assembly is retracted. These operations are controlled by circuits operated by properly placed switches and trippers or dogs.

Referring now to FIGS. 3. 4, 5, 6 and 7, the assembly, for example 21 supported on the annular table 20, includes a base 70, supporting a pair of shafts or supporting guides 7| and 72. The drill bushing 73, 74. 75 and 76 are mounted on a bushing plate or slide support 77 slidahly supported on the guide 71 and 72 by a pair of ball bushing blocks 78 and 79 being shown.

A housing 80 supports the drill spindles SI. 82. 83 and 84 in ball bearing assemblies as shown (FIG. 4). The spindles are provided with the drive pulley 85. 86. 87 and 88. These spindles are driven by motor 89 by means of belt 90 which engages the drive pulleys 85, 86. 87 and 88 as well as idler pulleys 90, 91 and 92.

The housing 80 is slidahly supported on guides 7i and 72 by means of four ball bearing bushing blocks two of which 93 and 94 are mounted on guide 7!. The other two on guide 72 are not shown (FIG. 3). Thus it will be seen that the bushing plate 77 and housing 80 are independently slidable on the guides 71 and 72.

The bushing mounting plate 77 and the spindle housing 80 are moved toward the work piece together by means of a hydraulic cylinder. When the bushings are in their work position further movements toward the work pieces is stopped as will be described below. This movement toward the work position is made rapidly. At this point a cam which contacts a follower on the spindle housing 80, is caused to rotate. The spindle housing is moved toward the work pieces for causing the drills to move into the work pieces. When drilling operations are completed the drills and bushings are automatically retracted.

The mechanism for advancing the busing and drill assembly rapidly to working position includes (FIGS. 3, 4 and 5) a hydraulic cylinder 95. The cylinder is fastened to the base by means of bracket 96. The piston rod 97 is connected to the drill housing by a block 98. When the piston is energized to move the housing to the right (FIGS. 3 and 4) the follower 99 fixed to the housing 80 comes in contact with a high spot on the cam I00 attached to the driving shaft of driving motor 10]. At this point motor I0] is energized causing the cam I00 to rotate. Since hydraulic cylinder biases the follower 99 against the cam I00, because of the cam shape the drill housing moves to the right and the drills advance through the bushings to perform drilling operations. Upon completion of drilling the drills are retracted and the drill housing 80 and bushing plate 77 are returned to these initial positions. The drills are fed in and out slowly.

To precisely position the bushings at their forward working position. there is attached to the bushing mounting plate 77, a rod I10 slidable through a block "I fixed to base 70. Fixed to rod "0 is a screw "2. cooperating with a cup shaped stop out 113. This step not upon engagement with block ill prevents further movement of the bushing mounting plate toward the work pieces. The limiting position of the bushing plate can be varied by repositioning sto7 nut "3 on screw H2. This arrangement permits minute and accurate positioning of the bushing. As will be described hydraulic piston continues to bias the drill housing 80 to the right (FIG. 3) maintaining follower 99 against cam 100 which on rotating presents a shorter radius to the follower so that the drills can move into the work piece.

Means are provided on housing 80 for retacting the bushing plate 77 when the housing is retracted to its non-working position. As shown in FIG. 6, a bracket 102 having an apertured plate 103 is attached to housing 80. A rod 104 passes slidably through plate 103 and is secured to the bushing plate 77. A compression spring I05 is mounted on the rod or spring guide 104. When forward movement of the bushing plate is stopped by stop nut I13. housing 80 can continue forward movement relative to plate 77. spring 105 being compressed and holding bushing plate forward. When the housing 80 is retracted plate 103 engages the head 106 of rod I04 retracting bushing plate 77.

TAPPING ASSEMBUES The tapping assembly includes a slide housing rotatably supporting a plurality of tapping spindles and a rotatable lead screw all driven from a common drive. The housing is slidahly supported on a pair of case shafts or guides mounted on a base. A slide mounted on one of the guides has fixed thereto and supports a lead screw not engaging the lead screw on the housing. A hydraulic cylinder mounted on the base is connected to the lead screw nut supporting slide and controls rapid movement toward and from the work position of the housing slide to position the tappers in their operating position. The lead screw then causes feeding of the plurality of tappers into the work pieces.

Referring to FIGS. 8. 9 and I0 the tapping spindle assembly includes a base I supporting a pair of case shafts or guides I31 and I32. A tapping spindle assembly slide housing I33 is supported on guides I3I and I32 by means of ball bushing blocks I34 and I35 mounted on guide 131 and two others (not shown) mounted on guide I32.

Mounted within the housing 133 are a plurality of ball bearing supported tapping spindles I36. I37. I38 and I39. Also rotatably supported in housing I33 is the lead screw I40. The tapping spindles and lead screw I40 are provided with worm gears I41, I42. I43, I44 and I45 for driving the tappcrs and the lead screw to advance the tappers simultaneously at the proper rate of rotation to produce the desired pitch.

A worm shaft I46. has mounted thereon and secured thereto driving worm wheels I47. I48, I49, I and I5I. Shaft I46 is driven by pulley I52 connected to motor I53 by belt I54.

Mechanism is provided for rapidly moving the housing I33 and tapping spindles to initial working position and then starting tapping operations.

Mounted on guide I3I by means of ball bearing supported slide I56 is the non-rotatable lead screw nut I57. Also mounted on slide I56 is the bracket I58 carrying an adjustable stop screw I59. Contact between stop screw I59 and rest button I60 mounted on the base limits movement of the tapping assembly housing toward the work pieces. A hydraulic cylinder I6I is pivotally attached to the base I30 by yoke I62. The piston rod of hydraulic cylinder I6I is attached to slide I56 by means of bracket I5II.

When the assembly is in its retracted position there is no contact between stop screw I59 and rest button I60. Also since slide I56 is connected to lead screw I40 by means of lead screw nut I57 action of hydraulic cylinder [6] will move the housing assembly between retracted position and starting position at any rapid desired speed depending upon speed of operation of the hydraulic cylinder.

When the stop screw 15') contacts stop button I60 on base I30. further movement of the housing toward the work pieces ceases. At this point rotation of the motor I53 begins causing rotation of the tappers and the lead screw to advance the housing 133 toward the work pieces. When tapping operations cease the tappers and lead screw are reversed with drawing the tappers and moving the housing to retracted position. Switches and controlling elements for these operations will be described below.

CIRCUIT AND CONTROLS FOR THE DRILLING ASSEMBLY Reference is made to FIGS. 4, 5 and II. The mechanical trip switches as shown in these figures are identified by the same letter symbols. As the drilling assembly including the drill bushing sub-assembly and the drilling spindle sub-assembly moves toward and from operating positions. trippers activate the various switches for controlling relays and solenoids for energizing the hydraulic cylinders and motor governing the operation of the drilling sub-assemblies.

The drilling circuit operation is described below. The successive steps are indicated in the diagram shown in FIG. II by the numerals I to I2 on the left hand side of the diagram.

l Table 'l'urret Indexes A During index cycle. relay ILR latches.

II ILR contact closes. energizing HLR unlatch coil.

( IR contact closes, energizing FLR unlatch coil.

2 FLR and HLR contacts close 3 At end of index. IR contact closes, completing circuit to energize Fixture Out solenoid.

4 When the fixture reaches Out position it closes the FOLS switch. energizing Bank In solenoid.

5 When the bank (assembly) reaches In position BILS switch closes energizing CRFL and CRF2 relays.

6 I3 CRFL and CRF2 contacts close. energizing Cam Forward solenoid.

7 The cam casues the bank to move into the work pieces. When bank reaches maximum IN position it closes BRLS switch energizing BRRI and BRR2 relays.

Ii BRRI and BRR2 contacts close energizing Bank Out solenoid.

9 As bank reaches maximum Out position it contacts BOLS switch. energizing SPRI and SPR2 relays.

lt) SPRI and SPR2 contacts close. energizing BOR relay.

l l BOR contact closes. energizing Fixture In solenoid.

l2 As the fixture moves to In position. FRLS switch is contacted. which in turn energizes the FRLR latch relay thereby completing the index circuit.

The BILS switch is operated by the dog I carried on the bushing plate assembly 77. Switch BRLS is operaled by the dog I86 carried on the drilling subassembly housing. Switch BOLS is also activated by dog I86.

CIRCUIT AND CONTROLS FOR THE TAPPING ASSEMBLY Reference is made to FIGS. 8. 9 and 12.

The tapping operation is described below. The steps are indicated in FIG. 12 by the numerals I to I7 on the left hand side of the diagram.

I Tables Indexes A During index cycle. relay ILR latches.

B ILR contact closes. energizing HLR unlatch coil.

C IR contact closes. energizing FLR unlatch coil.

2 FLR and HLR contacts close.

3 At end of index. IR contact closes. completing circuit to energize Fixture Out solenoid.

4 When the fixture reaches Out position the FOLS switch closes. energizing the Bank In solenoid.

5 When the bank (assembly) reaches In position BILS switch is closed. energizing CRFI and CRF2 relays.

6 CRFI and CRF2 contacts close. energizing the Tap Forward solenoid.

7 The tap Forward solenoid causes the hydraulic motor to rotate the feed screw I40 which drives the tap into the work pieces.

8 As the taps reach maximum In position. the bank contacts the TRLS switch which energizes the TRI latch coil.

9 TLR contact opens deenergizing tap forward solenoid.

l0 'I'LR contact closes energizing tap reverse solenoid.

ll Tap feed screw reverses until bank contacts TSLS switch which stops tap.

l2 Other side of TSLS switch closes and energizes BRRl relay.

l3 BRRl contacts close energizing the Bank Out solenoids.

l4 As the bank reaches maximum Out position BOLS switch is closed energizing SPRl relay.

l5 SPRl contacts close, energizing BOR relay.

l6 BOR contact closes, energizing Fixture ln solenoid.

l7 As the fixture moves to In position the FRLS switch is contacted. which in turn energizes the FRLR latch relay thereby completing the index circuit.

The BILS switch is operated by the dog 180 mounted on slide 156. Switch TRLS is actuated by dog 18! mounted on the lead screw nut 157. Switch TSLS is actuated by the dog 182 mounted on the housing 133 and switch BOLS is actuated by the dog 183 also mounted on the housing 133.

What is claimed is:

1. An assembly for supporting a plurality of parallel tool supporting spindles including:

a. a base;

b. a housing slidably mounted on said base, said housing comprising a tool housing which is slidably mounted on said base and a support plate mounting a guide bushing for each tool, said support plate mounted on the base independently of the tool housing;

c. mechanical means connected between said base and said housing for moving said housing along said base, said mechanical means comprising:

i. selectively operable means for advancing the tool housing and support plate under an applied force along the base toward the work piece to a predetermined position spaced from the work piece and for retracting the drill housing and support plate to their initial position;

ii. motion limiting means for stopping movement of the support plate toward the work piece at said predetermined position;

iii. lost motion means connecting the housing to the support plate for advancement as a unit between said initial and predetermined position but permitting movement of the drill housing relative to the support plate between said predetermined position and the work piece; and

iv. cam stop means disposed in the path of movement of the tool housing at said predetermined position for imparting reciprocal movement to the drill housing to move the tool contained therein into and out of operative engagement with the work piece;

d. a plurality of parallel tool holding spindles on said tool housing;

e. driving pulleys mounted at one end of each of said spindles;

f. idler pulleys spaced from and intermediate said driving pulleys;

g. a main pulley on said housing;

h. a common continuous belt engaging all of said pulleys; and

i. a reversible hydraulic motor connected to said main pulley.

t l Ht i 

1. An assembly for supporting a plurality of parallel tool supporting spindles including: a. a base; b. a housing slidably mounted on said base, said housing comprising a tool housing which is slidably mounted on said base and a support plate mounting a guide bushing for each tool, said support plate mounted on the base independently of the tool housing; c. mechanical means connected between said base and said housing for moving said housing along said base, said mechanical means comprising: i. selectively operable means for advancing the tool housing and support plate under an applied force along the base toward the work piece to a predetermined position spaced from the work piece and for retracting the drill housing and support plate to their initial position; ii. motion limiting means for stopping movement of the support plate toward the work piece at said predetermined position; iii. lost motion means connecting the housing to the support plate for advancement as a unit between said initial and predetermined position but permitting movement of the drill housing relative to the support plate between said predetermined position and the work piece; and iv. cam stop means disposed in the path of movement of the tool housing at said predetermined position for imparting reciprocal movement to the drill housing to move the tool contained therein into and out of operative engagement with the work piece; d. a plurality of parallel tool holding spindles on said tool housing; e. driving pulleys mounted at one end of each of said spindles; f. idler pulleys spaced from and intermediate said driving pulleys; g. a main pulley on said housing; h. a common continuous belt engaging all of said pulleys; and i. a reversible hydraulic motor connected to said main pulley. 